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Navigation: The Method of the Marteloio (p. 48b)

This is the fourth page of Michael's demonstration of the marteloio method for navigating "mentally." Michael now completes his explanation of how to calculate the distance to land that has been sighted to the west. At the bottom of the page, he gives a second example of the trigonometric table on which the method was based. None of the rules of the marteloio required any actual use of trigonometry.